Subways grind out a dose of fine metals.
D016902:Air Pollution, Indoor / Q000032:analysis*; D002857:Chromium / Q000032:analysis; D004391:Dust; D004781:Environmental Exposure; D006801:Humans; D007501:Iron / Q000032:analysis; D008345:Manganese / Q000032:analysis; D009519:New York City; D010316:Particle Size; D013232:Steel; D014186:Transportation
D004391:Dust; D002857:Chromium; D013232:Steel; D008345:Manganese; D007501:Iron